feature 0.9 (#8)

docs: remove Tauri client references (not shipping Tauri client)

docs: clarify nuwaxcode is based on OpenCode, not fully self-developed

docs: change license badge from MIT to Apache 2.0

docs: remove IM from core services table

docs: remove unimplemented features (IM integration, sandbox) from README

docs: rewrite README for NuwaClaw Electron client and MCP proxy

发布 0.9.0

ci: add sync-electron-to-oss.yml for workflow_dispatch (sync release to OSS)

first commit